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Radiation from the sun
1. The sun's radiation can be approximated by a black body. The surface temperature of the sun is about 5800 K and its radius is 0.7 × 109 m. The distance from the earth to the sun is 1.5 × 1011 m. The radius of the earth is 6.4 × 106 m. Estimate the average temperature of the earth from this information. Be careful to state your assumptions and approximations explicitly.
2. From the nature of your assumptions in the previous question (rather than your knowledge of the actual temperature), would you expect a more accurate calculation with this data to give a higher or lower answer? Explain your reasons clearly to obtain one bonus point per reason.
What is a Hall-effect tachometer? Discuss the advantages and disadvantages of a Hall effect motion sensor in comparison with an optical motion sensor (e.g., an optical encoder).
What are the principle advantages of the Arall material compared with those of unreinforced aluminum?
A pump delivers 40 litres/min to a 90 mm bore/30 mm rod cylinder to lift a load of 200 kg. What is the pressure exerted on the piston? What is the speed at which the load will be lifted? How much power is required to lift the load at this speed?
Air at 1 atm with dry-bulb and wet-bulb temperatures of 82 and 688F, respectively, enters a duct with a mass flow rate of 10 lb/min and is cooled at essentially constant pressure to 628F. For steady-state operation and negligible kinetic and p..
a piston-cylinder device contains 0.15kg of air initially at 2mpa and 350oc. the air is first expanded isothermally to
The slender 15-kg bar is initially at rest and standing in the vertical position when the bottom endAis displaced slightly to the right. If the track in which it moves is smooth, determine the speed at which endAstrikes the cornerD. The bar is co..
A heat-treated steel shaft is to be designed to support the spur gear and the overhanging worm shown in the figure. A bearing at A takes pure radial load. Identify the material and its heat treatment
A work platform is elevated on the end of a boom that has the ability to extend its length and vary its angle with respect to the ground. The platform width is large compared to the boom diameter so that it is possible to load the boom eccentrically ..
air in a piston-cylinder assembly expands slowly from an initial state where the pressure is 250 kpa and the volume is
What is the most likely source of the gas bubbles? Why are they present only at the location noted? What might you recommend as a solution?
It is desired to design a wind turbine that will output 2MW of peak electrical power at a location where the average wind speed is 10 m/s and the average ambient conditions are 85 kPa and 5 ?C. What should the rotor blade length be if the aerodynamic..
a bus starts from rest on a 200 m radius curve and accelerates with its speed increasing at at 2 ms2. determine the
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